Question: At what point did the United States Postal Service employ 546,000 people?
Paraphrase: Which year did the USPS employ 546,000 people?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q668687 p:P1128 ?s . ?s ps:P1128 ?x filter(contains(?x , '546000.0')) . ?s pq:P585 ?value}